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Metformin Preserves Peripheral Nerve Damage with Comparable Effects to Alpha Lipoic Acid in Streptozotocin/High-Fat Diet Induced Diabetic Rats
Sun Hee Kim, Tae Sun Park, Heung Yong Jin
Diabetes Metab J. 2020;44(6):842-853.   Published online May 28, 2020
DOI: https://doi.org/10.4093/dmj.2019.0190
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  • 12 Web of Science
  • 12 Crossref
AbstractAbstract PDFPubReader   ePub   
Background

Metformin is widely marketed medication for the treatment of diabetes, but its pharmacological effect on diabetic peripheral neuropathy remains unclear. In this study, the effect of metformin on peripheral nerves in diabetic rats was investigated using diverse neuronal parameters of nerve fibers.

Methods

Rats were assigned to one of four groups (n=7 to 10 per group): normal, diabetes mellitus (DM), DM+metformin (100 mg/kg), and DM+alpha lipoic acid (ALA, 100 mg/kg). DM was induced by streptozotocin/high-fat diet (STZ/HFD). After 12 weeks, the sensory thresholds to mechanical and heat stimuli were assessed. Repeated sensory tests, immunofluorescence microscopic comparison of peripheral nerves, and biochemical blood analysis were performed after 24 weeks.

Results

Both DM+metformin and DM+ALA groups showed similar trends to diverse sensory tests at 24 weeks compared to DM group although the degree of change were different according to the stimulated senses. There was no significant difference in the comparison of the intraepidermal nerve fiber density (IENFD) of peripheral nerves between the DM+metformin and DM+ALA groups (11.83±0.07 fibers/mm vs. 12.37±1.82 fibers/mm, respectively). Both groups showed preserved IENFD significantly compared with DM group (8.46±1.98 fibers/mm, P<0.05). Sciatic nerve morphology of the experimental animals showed a similar trend to the IENFD, with respect to axonal diameter, myelin sheath thickness, and myelinated fiber diameter.

Conclusion

Metformin has beneficial pharmacological effects on the preservation of peripheral nerves in diabetic rats and its effects are comparable to those of ALA.

Citations

Citations to this article as recorded by  
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    Journal of Diabetes and its Complications.2024; 38(6): 108737.     CrossRef
  • Effect of Metformin on the Functional and Electrophysiological Recovery of Crush Injury-Induced Facial Nerve Paralysis in Diabetic Rats
    Kyung Hoon Sun, Cheol Hee Choi, Gwang-Won Cho, Chul Ho Jang
    Journal of Personalized Medicine.2023; 13(9): 1317.     CrossRef
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    International Journal of Pharmaceutical Sciences and Nanotechnology(IJPSN).2023; 16(2): 6427.     CrossRef
  • Bidirectional association between diabetic peripheral neuropathy and vitamin B12 deficiency: Two longitudinal 9-year follow-up studies using a national sample cohort
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  • Metformin as a potential therapeutic for neurological disease: mobilizing AMPK to repair the nervous system
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    Expert Review of Neurotherapeutics.2021; 21(1): 45.     CrossRef
  • Metformin Preserves Peripheral Nerve Damage with Comparable Effects to Alpha Lipoic Acid in Streptozotocin/High-Fat Diet Induced Diabetic Rats (Diabetes Metab J 2020;44:842-53)
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    Diabetes & Metabolism Journal.2021; 45(1): 125.     CrossRef
  • Metformin Preserves Peripheral Nerve Damage with Comparable Effects to Alpha Lipoic Acid in Streptozotocin/High-Fat Diet Induced Diabetic Rats (Diabetes Metab J 2020;44:842-53)
    Sun Hee Kim, Tae Sun Park, Heung Yong Jin
    Diabetes & Metabolism Journal.2021; 45(1): 127.     CrossRef
  • Impacts of statin and metformin on neuropathy in patients with type 2 diabetes mellitus: Korean Health Insurance data
    Hong Ki Min, Se Hee Kim, Jong Han Choi, Kyomin Choi, Hae-Rim Kim, Sang-Heon Lee
    World Journal of Clinical Cases.2021; 9(33): 10198.     CrossRef

Diabetes Metab J : Diabetes & Metabolism Journal